Methods for producing agglomerates of metal powders and articles incorporating the agglomerates
a technology of agglomerates and metal powders, which is applied in the manufacturing process of electrodes, cell components, transportation and packaging, etc., can solve the problems of affecting the performance of agglomerated powders, the inability to process high-speed manufacturing machines, and the inability to meet the requirements of high-speed manufacturing machines
Inactive Publication Date: 2008-09-04
ENERGIZER BRANDS
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Benefits of technology
The present invention is a process that produces rigid, binder-free agglomerates that can be mixed with non-agglomerated particles to create a flowable mixture. This process involves providing an electrochemically active material in comminuted form and then forming rigid agglomerates consisting of the electrochemically active material. The resulting agglomerates can be used in various applications such as electrodes for batteries and hydrogen storage vessels. The technical effect of this invention is the creation of uniform, high-quality agglomerates that enhance the performance of the resulting products.
Problems solved by technology
Unfortunately, as the percentage of particles that are 25 microns or smaller increases, the viscosity of the anode may become too high to process in high speed manufacturing machines.
Thus, these processes are not well suited for the production of electrodes that incorporate both agglomerated electrochemically active particles and non-agglomerated electrochemically active particles in the same electrode.
Unfortunately, the use of an agglomerant may have a negative impact on the performance of the agglomerated powder.
Furthermore, there are potential problems associated with the cost of the binder as well as the volume of space occupied by the binder.
Method used
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[0020]The following terms and phrases are defined for use herein.
[0021]The phrase “rigid, binder free agglomerate,” means an assemblage of particles which are rigidly joined together without the use of a binder. Therefore, each particle is physically secured to at least one other particle in the rigid, binder free agglomerate. Particles that are in close proximity to one another but are not associated via a physical connection are not considered to form a rigid, binder free agglomerate.
[0022]The term “agglomerated particles” means two or more particles that form an agglomerate.
[0023]The term “non-agglomerated particles” means two or more particles that are not physically associated with each other.
[0024]Referring now to the drawings and more particularly to FIG. 1, there is shown a chart of process steps including both required and optional steps. Step 10 involves providing a quantity of electrochemically active material in comminuted form. In a preferred embodiment, the active mate...
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Abstract
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a division of U.S. patent application Ser. No. 10 / 346,783, filed Jan. 17, 2003, and entitled “METHODS FOR PRODUCING AGGLOMERATES OF METAL POWDERS AND ARTICLES INCORPORATING THE AGGLOMERATES.” The aforementioned related application is hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]This invention generally relates to a process for producing agglomerates of metal powders. More particularly, this invention is directed to a process for producing rigid, porous, binder free agglomerates of metal powders. This invention is also directed to devices that include the rigid, binder free agglomerates.[0003]Fine metal powders are used in a wide variety of devices to enable desirable chemical reactions. For example, catalysts are incorporated in the catalytic converts of vehicles powered by combustion engines. The catalyst facilitates the conversion of potentially harmful fumes to environmentally acceptable g...
Claims
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IPC IPC(8): H01M4/42B22F1/052B22F1/068B22F1/148H01M4/02H01M4/04H01M4/24H01M4/38
CPCB22F1/0014B22F1/0055Y02E60/124H01M4/42H01M4/383H01M4/244H01M4/242H01M4/0488H01M4/0483H01M4/0471H01M4/043H01M4/04H01M4/02B22F2999/00B22F1/0096B22F2998/00B22F2998/10B22F9/04B22F1/0003B22F1/0007B22F2202/01Y02E60/10B22F1/068B22F1/052B22F1/148B22F1/00B22F1/06
InventorRU-FENG TSAI, PETERCIU, NING
OwnerENERGIZER BRANDS